docs: def get(self):
          """
          Returns the underlying value or raise the underlying exception
          """
          val = self.pik.unpickle()
          if self.tb_str:
              etype = val.__class__
              msg = '\n%s%s: %s' % (self.tb_str, etype.__name__, val)
              if issubclass(etype, KeyError):
                  raise RuntimeError(msg)  # nicer message
              else:
                  raise etype(msg)
          return val